Field evolution of the magnetic structure and spin Hamiltonian in Cs$_2$RuO$_4$

S. D. Nabi; E. Ressouche; D. G. Mazzone; J. Lass; R. Sibille; Z. Yan; S. Gvasaliya; A. Zheludev

Field evolution of the magnetic structure and spin Hamiltonian in Cs$_2$RuO$_4$

Strongly Correlated Electrons 2026-05-25 v1

Authors: S. D. Nabi , E. Ressouche , D. G. Mazzone , J. Lass , R. Sibille , Z. Yan , S. Gvasaliya , A. Zheludev

Abstract

We report neutron diffraction under applied magnetic fields and complementary zero-field neutron spectroscopy measurements on Cs $_2$ RuO $_4$ . Previous work [Phys. Rev. B. 112, 134436 (2025)] identified a spin-flop-like transition accompanied by a quantum critical point within the ordered phase, attributed to strong frustration between alternating single-ion anisotropy planes. Here, we quantitatively confirm the predicted field evolution of the magnetic structure using neutron diffraction. Furthermore, analysis of the excitation spectrum within an SU(3) spin-wave framework resolves previously undetermined parameters of the minimal spin Hamiltonian and lifts the associated degeneracies.

Keywords

neutron diffraction magnetic structure spin Hamiltonian spin-flop transition SU(3) spin wave quantum critical point

Cite

@article{arxiv.2605.23363,
  title  = {Field evolution of the magnetic structure and spin Hamiltonian in Cs$_2$RuO$_4$},
  author = {S. D. Nabi and E. Ressouche and D. G. Mazzone and J. Lass and R. Sibille and Z. Yan and S. Gvasaliya and A. Zheludev},
  journal= {arXiv preprint arXiv:2605.23363},
  year   = {2026}
}

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9 pages, 8 figures

Field evolution of the magnetic structure and spin Hamiltonian in Cs$_2$RuO$_4$

Abstract

Keywords

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